How do Cornell and Dartmouth compare for undergraduate teaching quality?

For undergraduate teaching, Dartmouth usually has the edge if what you care about most is small classes, easy professor access, and a campus built primarily around undergraduates. Dartmouth is much smaller, has a stronger liberal arts college feel, and its quarter-based D-Plan often creates close, repeated contact with faculty. Cornell absolutely offers excellent teaching too, but the experience is less uniform because it is a much larger university with multiple undergraduate colleges and a wider mix of class sizes.

Dartmouth tends to suit students who want discussion-heavy courses and a classroom culture where professors are highly visible in undergraduate life. Smaller departments and fewer graduate programs in many areas mean undergrads are more often the main audience rather than sharing attention with large numbers of grad students. In practice, that can make office hours feel more approachable and class participation more central to the course.

Cornell fits students who want outstanding academics but are comfortable navigating a bigger, more decentralized place. You can absolutely build strong faculty relationships there, especially once you move past intro courses, join a lab, or work closely within your college or major. But in real life, the first-year experience in some subjects can include larger lectures, more variation across departments, and more dependence on TAs, especially in STEM.

The class-size difference does usually matter. At Dartmouth, it is more likely to shape your daily experience from the start. At Cornell, small seminars and close mentoring are very possible, but they are less likely to define every part of your undergraduate experience, especially early on.

So if your top priority is consistently intimate teaching and direct faculty interaction, Dartmouth is the clearer match. If you want that possibility within a much broader university environment, with more departments and course options, Cornell can still deliver it, just with more variation and more initiative required from you.